Loom dobby



Feb. 17, 1931. w. E. LL-JNDGREN LOOM 'DOBBY glle sge t. 12. 1929 fv VEN 70/? WM. iLu/vasms/v Patented Feb. 17, 1931 UNITED STATES WILLIAM E. LUNDGREN, or woncns rnn.rvmssncnusnrrs, ASSIGNOR r cnomrron &

KNOWLES LOOM. VIORKS, OF WOECESTER, IIIASSACI-IUSETTS, A

. MASSACHUSETTS CORPORATION or oom DOBBY Application filed September 12, 1929. Serial No. 392,174.

This invention relates to dobbiesi for looms and it is the general object of the invention to facilitate dobby repair by providing means to hold the hook lifter rods in position when their supporting fingers are removed. 7 p

Dobbies usually operate with two sets of hooks the lower of which have direct engagement with certain of thedobby fingers and the upper of which are connected to the other dobby fingers through so-called lifter rods. When dobby fingers become broken or worn so as to require renewal it is desirable to be able to remove them without causing loss or displacement of the lifter rods. It is also desirable toavoid a bending operation and make the rods of such size that their upper ends will present large wearing surfaces for the hooks which they support. In order to accomplish this result it is an important object of my present invention to provide a substantially straight lifter rod of substantial proportions the lower end of which is reduced to provide a shoulder which will engage a fixed part of the dobby to hold the rod in position when the corresponding finger is removed.

VV'th these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein a convenient embodiment of my invention is set forth,

Fig. 1 is a vertical section through a dobby having my invention applied thereto,

Fig. 2 is a vertical section on line 2-2 of Fig. 1,

Fig. 3 is a detailed horizontal section on line 33 of Fig. 2, and

Fig. l is a view similar to a portion of Fig. 1 but on an enlarged scale.

Referring to the drawings, the dobby frame has upper and lower parallel horizontal guide slots 11 and 12, respectively, in which reciprocate hook lifting knives 13 and 1%, respectively. The knives 13 and lt have cooperation with upper and lower hooks 15 and 16, respectively. The hooks are pivotally connected to a dobby lever 17 connected as at 18 ton harness lifting jack a portion of which is shown at '19. Back stays 20 limit movement of the upper and lower ends of the lever 19 to the left as viewed in Fig. 1.

Ac bar 21 extendsacross' the dobby and affords support for a plurality of dobby fingers 22, certain of which have upturned ends 23toihave direct engagement with the lower hooks 16, while others have straight ends 24 and are'designed to control the upper hooks 15. A pattern cylinder 25 presents a pattern chain 26 to control the'rising and falling of the fingers. A comb 27 has vertical slots 28 through which extend the low hooks 16, said slots also having'extendingtherethrough the upturned finger ends 23.

The matter thus far described is of common construction and operates in the usual manner theknives -13 and 14 having oppo site reciprocating movements and the hooks 15 and 16falling into the pathsof movements of their respective knives depending upon the control" exercised by the pattern chain 26. When either hook is moved to the right as viewed in Fig. 1 the corresponding jack 19 and harness frame will be raised, whereas, if neither hook of a pair is moved thev corresponding harness frame will be held down by the usual pulldown spring not shown.

In carryingrmy inventioninto effect I provide an improvedform of lifter rod designats. ed at 30 and having an upperportion 31 of relatively large cross section which passes through a fixed guide 32 so as to be in proper alignment withtheupperhooks. Fingers, one; of which is designated at 33 in Fig. 1, position the hooks so that they are always so placed as to be lifted by the rod thereunder when the latter is moved upwardly. The lower end of the'hook is reduced as at 34. to form a shoulder 35. The comb 27 is provided with a plurality of'holes 36 through which the lower ends of the rods extend, but these holes are too small to pass the upper end of the rods.

The holes 36 are aligned with the straight extensions 34 and the latter it will be observed do not extend through any guide, being po-.

sitioned byadjacent upturned ends 23. The

latter ends are determined as to their position straight lifter by the slots 28 and thus indirectly said slots position the straight ends 24 to hold the same in proper relation with respect to the reduced ends of the lifter rods.

In operation, the lifter rods will move up and down with the straight ends 24. Vhen it is necessary to remove any of the fingers having straight ends, an upper guide rod 87 similar to that shown in patent to Pfeiifer No. 1,174,895 will be removed, after which the defective finger will be lifted off the bar 21 and taken out of the dobby, Under these conditions the lifter rod corresponding to the removed finger will fall until the shoulder 35 thereof engages the comb 27. after which further downward movement of the rod will be prevented. The parts are so proportioned that the shoulder will engage the comb 27 before the upper end of the lifter rod moves out of guiding relation with respect to the member 32 at the top of the dobby.

From the foregoing it will be seen that I have provided a very simple form of lifter rod which is substantially straight, being free from bends and having a cross section sufiicientlylarge sothatthe upper end thereof will present a durable wearing surface to theunder sides of the upper hooks 15. It will further be seen that the reduced ends of the rods define shoulders which limit downward movement of the rods when defective fingers are to be removed. Furthermore, the comb 27 and guide 32 are so related with respect to the length of the lifter rods above the shoulder than when said rods are supported by their shoulders engaging the comb the upper end of the rods will still be in guiding relation with respect to the member 32.

Having thus described my invention it will. be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a loom dobby having a hook to be moved and a controlling dobby finger therefor spaced therefrom, a substantially straight lifter rod lying between the finger and the hook and normally supported by the finger to be moved thereby into engagement with the hook to move the latter, a pair of spaced guides between the hook and finger, the lifter rod passing through both guides, the lower end of thelifter rod being reduced and extending through the guide adjacent the finger, a shoulder on the rod adjacent the reduced end, said shoulder to engage the guide adjacent the finger and hold the rod in supported position when the finger is removed.

2. In a loom (lobby having a hook to be moved and a controlling (lobby finger therefor spaced therefrom, a substantially rod lying between the finger and the hook and normally supported by the finger to be moved thereby into engagement with the hook to move the latter, a pair of spaced guides between the hook and finger, the lifter rod passing through both guides, the lower end of the lifter rod being reduced and extending through the guide adjacent the finger, a shoulder on the rod near the reduced end, said shoulder to engage the guide adjacent the finger and hold the rod in supported position when the finger removed, the distance between the guides being less than the distance between the shoulder and the upper end of the rod.

In testimony whereof I have hereunto affixed my signature.

\VILLIAM E. LUNDGREN.

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